I've been asked a lot lately if tennis is clean or not. I don't know any more how you judge whether a sport is clean. If one in 100 players is doping, in my eyes that isn't a clean sport.

Let it be your business every day, in the secrecy of the inner chamber, to meet the holy God. You will be repaid for the trouble it may cost you. The reward will be sure and rich.

I believe you should give 100% on the court, so I chase every ball.

One of the worst things sin did for man was to make him selfish, for selfishness cannot love.

Normally I sleep for 9, 10 hours a night.

I've realised over the years I play my best when I have time to prepare for each tournament as best as possible.

Shut the world out, withdraw from all worldly thoughts and occupations, and shut yourself in alone with God, to pray to Him in secret. Let this be your chief object in prayer, to realize the presence of your heavenly Father.